Modalert 200mg promotes wakefulness and helps reduce excessive daytime sleepiness, so falling asleep may be more difficult for some people after taking it. Its effects can last for many hours, potentially affecting nighttime sleep if taken too late in the day. The timing of the dose, individual response, and sleep habits can influence its effects. Modalert 200mg should be taken as prescribed by a healthcare professional. Avoid taking extra doses to stay awake, and consult your doctor if you experience persistent insomnia or sleep difficulties.